Filter



FIG. 1 is a top-front perspective view of a filter;

FIG. 2 is a bottom-front perspective view of the filter of FIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a right side elevational view thereof; and,

FIG. 8 is a left side elevational view thereof.

The ornamental design which is claimed is shown in solid lines in the drawings. 

CLAIM The ornamental design for a filter, as shown and described. 